13001( 3) - 05-Oct-2012 18:43:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13001 Version: 3 Check-in Time: 05-Oct-2012 18:43:23 STScI Edit Number: 0 Title SDSS 0921+28: A unique lensed quasar system ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Eran O. Ofek Weizmann Institute of Science Y CoI: Dr. Keren Sharon University of Michigan N CoI: Dr. Assaf Horesh California Institute of Technology N ------------------------------------------------------------------------------------ Abstract SDSS 0921+28 is a unique small-separation (1.9") lensed quasar system we found recently. Adaptive optics imaging shows several images of at least two lensed objects: A doubly lensed quasar; An inclined quad image of a lensed galaxy; and possibly an image of the lensed quasar host galaxy. As far as we know this is the first example (in visible light) of a galaxy-mass lens which is lensing multiple sources. We estimate that roughly $1$\% of the quasar lensed by galaxy mass objects have images of additional lensed sources. The existence of a lensed quasar that allows to measure the time delay along with many constraints (maybe of sources at different redshifts) will be a powerful tool for cosmological study as well as to probe the quasar host galaxy in great details. Here we propose to obtain 4 band imaging of the system using 2 HST orbits. Combined with the AO K-band observations this will allow to obtain accurate photometric redshift of the different sources; study their morphology and accurately modeling of the lensing potential. Specifically, the accurate modeling of the lensing potential will have important implications for measurements of cosmological parameters. ------------------------------------------------------------------------------------ Observations Description ------------------------ We request to observe the lensed quasar SDSS0921+28 using the F475W-band (ACS/WFC); F625W (ACS/WFC); F814W (WFC3/UVIS) and F110W (WFC3/IR) filters. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13001( 3) - 05-Oct-2012 18:43:23 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS092115.4 GALAXY, QUASAR RA=09H21M15.4700S +/- 0.1", J2000 V = 20.0 +/- 0.2 7+285444.3 DEC=+28D54'44.30" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13001( 3) - 05-Oct-2012 18:43:23 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13001( 3) - 05-Oct-2012 18:43:23 - [ 4] Visit: 01 Visit Requirements: GROUP 01, 02 WITHIN 14D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS092115. ACS/WFC ACCUM WFC1-512 F475W 1 260 S PATTERN 1 1 47+285444.3 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS092115. ACS/WFC ACCUM WFC1-512 F625W 1 261 S PATTERN 1 2 47+285444.3 ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS092115. WFC3/UVI ACCUM UVIS2-C51 F814W 1 288 S PATTERN 2 3 47+285444.3 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS092115. WFC3/IR MULTIAC IR F110W NSAMP=14, SAMP-SEQ=SPARS25 1 DEF PATTERN 3 4 47+285444.3 CUM ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS092115.47+28544 1 ACS/WFC ACCUM WFC1-512 F475W 1 none none none 1 N/A 4.3 SDSS092115.47+28544 1 ACS/WFC ACCUM WFC1-512 F475W 2 none none none 1 N/A 4.3 SDSS092115.47+28544 1 ACS/WFC ACCUM WFC1-512 F475W 3 none none none 1 N/A 4.3 SDSS092115.47+28544 1 ACS/WFC ACCUM WFC1-512 F475W 4 none none none 1 N/A 4.3 SDSS092115.47+28544 2 ACS/WFC ACCUM WFC1-512 F625W 1 none none none 1 N/A 4.3 SDSS092115.47+28544 2 ACS/WFC ACCUM WFC1-512 F625W 2 none none none 1 N/A 4.3 SDSS092115.47+28544 2 ACS/WFC ACCUM WFC1-512 F625W 3 none none none 1 N/A 4.3 SDSS092115.47+28544 2 ACS/WFC ACCUM WFC1-512 F625W 4 none none none 1 N/A 4.3 SDSS092115.47+28544 3 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 2 N/A 4.3 S 12C-SUB SDSS092115.47+28544 3 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 2 N/A 4.3 S 12C-SUB SDSS092115.47+28544 3 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 2 N/A 4.3 S 12C-SUB SDSS092115.47+28544 3 WFC3/UVI ACCUM UVIS2-C5 F814W 4 none none none 2 N/A 4.3 S 12C-SUB 13001( 3) - 05-Oct-2012 18:43:23 - [ 5] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SDSS092115.47+28544 4 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A 4.3 CUM SDSS092115.47+28544 4 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A 4.3 CUM SDSS092115.47+28544 4 WFC3/IR MULTIAC IR F110W 3 none none none 2 N/A 4.3 CUM SDSS092115.47+28544 4 WFC3/IR MULTIAC IR F110W 4 none none none 2 N/A 4.3 CUM 13001( 3) - 05-Oct-2012 18:43:23 - [ 6] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS ACS/WFC ACCUM WFC1-512 DEF GAIN=2.0, COMPRESSION=NONE 21 0 S Comments: This orbit is charged to ACS/CAL program 13164. ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 6 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 7 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 8 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 9 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 10 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 11 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 12 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 13 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 14 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 15 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 16 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 17 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 18 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 19 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 20 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-512 DEF none none 21 none 1 N/A 13001( 3) - 05-Oct-2012 18:43:23 - [ 7] Summary Form for Proposal 13001 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2-C512C-SUB, WFC1-512 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters COMPRESSION=NONE, GAIN=2.0, NSAMP=14, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, 02 WITHIN 14D, PATTERN 1 1, PATTERN 1 2, PATTERN 2 3, PATTERN 3 4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F110W, F475W, F625W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, SDSS092115.47+285444.3 ------------------------------------------------------------------------------------------------------------------------------------